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设a>0且a≠1,则“函数f(x)=ax在R上是减函数”,是“函数g(x)=(2﹣a)x3在R上是增函数”的( )
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高一下学期数学《》真题及答案
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设函数fx=ln1+x﹣ln1﹣x则fx是
奇函数,且在(0,1)上是增函数
奇函数,且在(0,1)上是减函数
偶函数,且在(0,1)上是增函数
偶函数,且在(0,1)上是减函数
设fx=lg+a是奇函数且在x=0处有意义则该函数是
(-∞,+∞)上的减函数
(-∞,+∞)上的增函数
(-1,1)上的减函数
(-1,1)上的增函数
5.00分设函数fx=ln1+x﹣ln1﹣x则fx是
奇函数,且在(0,1)上是增函数
奇函数,且在(0,1)上是减函数
偶函数,且在(0,1)上是增函数
偶函数,且在(0,1)上是减函数
设函数fx=ln1+x-ln1-x则fx是
奇函数,且在(0,1)上是增函数
奇函数,且在(0,1)上是减函数
偶函数,且在(0,1)上是增函数
偶函数,且在(0,1)上是减函数
设函数fx是定义在R.上的偶函数且对任意的x∈R.恒有fx+1=fx-1已知当x∈[01]时fx=1
设fx是R.上的偶函数且在0+∞上是减函数若x1<0且x1+x2>0则
f(﹣x
1
)>f(﹣x
2
)
f(﹣x
1
)=f(﹣x
2
)
f(﹣x
1
)<f(﹣x
2
)
f(﹣x
1
)与f(﹣x
2
)大小不确定
已知函数fx=3x-则fx
是偶函数,且在R.上是增函数
是奇函数,且在R.上是增函数
是偶函数,且在R.上是减函数
是奇函数,且在R.上是减函数
函数fx=ax3-x在R上为减函数则
a≤0
a<1
a<0
a≤1
已知函数fx=2|x-2|+axx∈R有最小值.1求实数a的取值范围2设gx为定义在R.上的奇函数且
已知函数fx=-x3+ax2+bx+c在-∞0上是减函数在01上是增函数函数fx在R.上有三个零点且
设fx=x∈R则fx是
奇函数且在(0,+∞)上是增函数
偶函数且在(0,+∞)上是增函数
奇函数且在(0,+∞)上是减函数
偶函数且在(0,+∞)上是减函数
设函数则fx是
奇函数,且在(0,1)上是增函数
奇函数,且在(0,1)上是减函数
偶函数,且在(0,1)上是增函数
偶函数,且在(0,1)上是减函数
设函数fx是定义在R.上的偶函数且对任意的x∈R.恒有fx+1=fx﹣1已知当x∈[01]时fx=1
设函数fx=ax2+bx+1ab∈R.且a≠0若f﹣1=0且对任意实数x不等式fx≥0恒成立.1求实
设函数fx是定义在R.上的偶函数且对任意的x∈R.恒有fx+1=fx-1已知当x∈[01]时fx=1
设fx是定义域为R.的偶函数且对任意实数x恒有fx+1=﹣fx已知x∈01时fx=1﹣x则函数fx在
是增函数,且f(x)<0
是增函数,且f(x)>0
是减函数,且f(x)<0
是减函数,且f(x)>0
对于求证函数fx=-x3在R.上是减函数用三段论可表示为大前提是对于定义域为D.的函数fx若对任意x
已知函数fx是定义域为R.的偶函数且fx+1=-fx若fx在[-10]上是减函数那么fx在[13]上
增函数
减函数
先增后减的函数
先减后增的函数
设fx是R上的偶函数且在0+∞上是减函数若x1<0且x1+x2>0则
f(-x
1
)>f(-x
2
)
f(-x
1
)=f(-x
2
)
f(-x
1
)<f(-x
2
)
f(-x
1
)与f(-x
2
)大小不确定
设a>0且a≠1则函数fx=ax在R.上是减函数是函数gx=2-ax3在R.上是增函数的______
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间距为l=0.5m两平行金属导轨由倾斜部分和水平部分平滑连接而成如图所示倾斜部分导轨的倾角θ=30°上端连有阻值R=0.5Ω的定值电阻且倾斜导轨处于大小为B1=0.5T方向垂直导轨平面向上的匀强磁场中.水平部分导轨足够长图示矩形虚线框区域存在大小为B2=1T方向竖直向上的匀强磁场磁场区域的宽度d=3m.现将质量m=0.1kg内阻r=0.5Ω长l=0.5m的导体棒ab从倾斜导轨上端释放达到稳定速度v0后进入水平导轨已知导体棒穿过B2磁场的过程中速度变化量与在磁场中通过的距离满足△v=k△x比例系数k未知运动过程中导体棒始终与导轨垂直并接触良好不计摩擦阻力和导轨电阻.求 1导体棒ab的速度v0 2导体棒ab穿过B2磁场过程中通过R的电荷量及导体棒ab产生的焦耳热 3若磁场B1大小可以调节其他条件不变为了使导体棒ab停留在B2磁场区域B1需满足什么条件.
15分为配合学校开展的垃圾分类工作学生会向全校学生发出了垃圾分类从我做起的倡议请你代表学生会用英语写一封倡议书.内容包括 1.垃圾分类的做法 2.垃圾分类的益处 3.呼吁全体学生一起参加. 注意1.词数80左右2.可适当增加细节以使行文连贯. 参考词汇垃圾分类garbageclassification厨余垃圾leftovers电池batteries.
30分Myfather'sillnesshadbeendiagnosedasoneoftheworstcancers.1awell﹣builtmanhehadlostmorethan30pounds.Thedoctors2thathehadonlythreetosixmonthstolive. TheotherdaywhenmyfatherwassittingupinbedI3himandsaidDadIfeel4sorryforwhathashappenedtoyou.YouneverknowhowmuchIreallyloveyou.Ileanedovertogivehimahug5hebecametense. ComeonDad.[said.Iknewshowing6wasnotourusualwayofrelation.Iasked himtositupsomemoreandItriedagain.Thistimehoweverhewas7moretense.Iwasalittleimpatientand1couldfeeltheoldresentment不满startingto8.ForyearsourgreetinghadbeenacoldandformalhandshakethatsaidHellohowareyou?MyfatherhadalwaysbeenveryGermanic.Inhischildhoodhisparentsmusthavetaughthimhowto9hisfeelingsinordertobea10. Lettinggoofmylong﹣held11toblamehimforourdistanceIwasactuallylookingforwardtothe12ofgivinghimmorelove.IsaidagainComeonDadputyourarmsaroundme.Iagainleanedupclosetohimatthe13ofthebedwithhisarmsaroundme. 14happened.ForaninstantafeelingofI15youthunderedthrough.NowbothheandIwaitedforthatmomentary16tohappenagain.Ittookmonths17hewasabletolettheemotionsinsidehimpassthroughhisarmsto18me. Afterallhewastryingto19thehabitsofanentirelifetimeandthattooktime.Afteraroundtheone﹣hundredthhughefinallysaidout20forthefirsttimeIcouldeverrecallIloveyou. 1A.Normally B.Generally C.Actually D.Apparently 2A.advised B.apologized C.urged D.concluded 3A.supported B.encouraged C.approached D.reminded 4A.highly B.deeply C.mainly D.mostly 5A.then B.so C.and D.but 6A.affection B.responsibility C.generosity D.excitement 7A.almost B.any C.even D.less 8A.pickup B.buildup C.keepup D.giveup 9A.shutoff B.putoff C.takeoff D.getoff 10A.teacher B.son C.father D.man 11A.ability B.desire C.experience D.plan 12Adifficulty B.adventure C.challenge D.memory 13A.end B.middle C.bottom D.edge 14A.Something B.Nothing C.Everything D.Anything 15A.support B.love C.hate D.oppose 16A.kindness B.goodness C.closeness D.happiness 17A.before B.when C.since D.that 18A.praise B.hold C.encourage D.raise 19A.develop B.form C.change D.kick 20A.calmly B.hopefully C.peacefully D.loudly
15分假如你是李华计划暑假去英国旅游.请你给在旅行社工作的朋友Jack写信内容包括 1.求荐必去景点 2.咨询准备工作 3.询问注意问题. 注意1.词数80左右 2.可适当增加细节以使行文连贯.
如图所示质量M=2kg的半圆形槽物体A放在光滑水平地面上槽内表面光滑其半径r=0.6m.现有一个质量m=1kg的小物块B在物体A的槽右端口获得瞬时竖直向下的冲量I=2N•S此后物体A和物块B相互作用使物体A在地面上运动则
实验室有一破损的双量程电压表两量程分别是3V和15V其内部电路如图所示因电压表的表头G已烧坏无法知道其电学特性但两个精密电阻R1R2完好测得R1=2.9kΩR2=14.9kΩ.现有两个表头外形都与原表头G相同已知表头的满偏电流为1mA内阻为50Ω表头的满偏电流0.5mA内阻为200Ω又有三个精密定值电阻r1=100Ωr2=150Ωr3=200Ω.若保留R1R2的情况下对电压表进行修复根据所给条件回答下列问题 1原表头G满偏电流I=内阻r=. 2在虚线框中画出修复后双量程电压表的电路标识出所选用的相应器材符号 3某学习小组利用修复的电压表再加上可以使用的以下器材 测量一未知电阻Rx的阻值 电流表A量程0~5mA内阻未知 最大阻值约为100Ω的滑动变阻器 电源E电动势约3V 开关S导线若干. 由于不知道未知电阻的阻值范围学习小组为精确测出未知电阻的阻值选择合适的电路请你帮助他们补充完整电路连接正确连线后读得电压表示数为2.40V电流表示数为4.00mA则未知电阻阻值Rx为Ω.
30分Thislifeissofullofbeautifulmoments.Allyouhavetodoisopenyoureyesandyour1toseethem.Isawonejusttheotherday. ThelocalelementaryschoolhadjustletoutandI2myselfbehindaschoolbusasIwas3home.Thebusstoppedbyahouse4ontopofahill.Alittlegirlnomorethan7yearsoldhoppeddownthebusstepsandstarted5upthedrivewaytowardthehouse.The6onherfacewascontagious有传染性的.Herlonghairwasbouncingoffhershouldersandherpinkbackpackwastrailingbehindher7sheran.Ilookedupthehilltoseewhereshewasgoingandsawherdad8her.Asshegotcloserandcloserherdadsmiledandkneltdownto9her.Thesecondshegottohimhewrappedhis10armsaroundherandgaveherahugehug. Myeyes11abitasIwatchedthis12andrememberedallthetimesmyownchildrenhadrunintomy13withsmilingfacesandlovinghearts.Everysingle14fromthemwasafountainofyouthandatreasureof15.Mylovelytripdownmemorylanewas16whenIheardthecarbehindmehonkitshorn.Isawtheschoolbusquickly17andstartedtofollowitagain.Ididso18withafullerheartandlighter19thanIhadbefore.Itookthatbeautifulmomentandstoreditsafelyinmysoul20Iknewitwouldremainforever. 1A.door B.ears C.heart D.window 2A.discovered B.realized C.looked D.saw 3A.walking B.driving C.arriving D.leaving 4A.sat B.seat C.sitting D.seating 5A.jumping B.dragging C.running D.passing 6A.look B.surprise C.eagerness D.smile 7A.until B.as C.unless D.because 8A.lookingfor B.watchingover C.waitingfor D.signingto 9A.dress B.shelter C.greet D.help 10A.powerful B.steady C.slim D.bare 11A.closed B.opened C.lowered D.watered 12A.event B.scene C.incident D.appointment 13A.room B.sight C.arms D.memory 14A.word B.hug C.gesture D.tear 15A.value B.freedom C.joy D.care 16A.changed B.corrected C.interrupted D.blocked 17A.givingaway B.pullingaway C.walkingaway D.takingaway 18A.however B.therefore C.besides D.instead 19A.sense B.spirit C.state D.burden 20A.where B.what C.which D.that
30分Noneofusgetoutoflifealivesobebraveandbethankfulforalltheopportunities机会youhave.Thosewere1wordssaidby18﹣year﹣oldJakeBaileyacancerpatient. BaileywasintheleadingpositionoftheStudents'Union.Theyoungmanhadplannedto2athishighschool'send﹣of﹣yearceremony典礼onschedule.3justtheweekbeforehereceivedshocking4.Afterseveralweeksofnotfeelingwelltestsshowedthathehadafast﹣growingformofcancer.Doctorssaidwithout5hewouldonlyhaveweekstolivesotheydidn't6himtotakepartintheevent.ButBaileyputonhisschooluniformalongwithhis7faceandlefthishospitalbedtogivetheinspiringspeechtohis8.Withoutdoubthissurpriseappearance9everyoneattheceremony.Sittinginthewheelchairhebeganto10hisideas.Heexpressedthatastrong﹣willedpersonwouldnoteasily11nomatterhowhardlifewas. AtthespeechBaileyencouragedhisschoolmatesto12theirtime.Thefutureistrulyinourhands.13abouthavingimpracticallong﹣termdreams.Let'sbe14toshort﹣termgoalsHe15.Wedon'tknowwherewemightenduporwhenwewillendupsoworkwithprideonwhatis16us. Whenthesenior17hisspeechwiththeschool's18AltioraPetowhichmeansIfightforhigherthingstheentireroomburstintocheers.19Bailey'smessagewasheardloudandclear.Baileythenclosedhiseyesand20thewordsThankyou. 1A.unbelievable B.genuine C.inspiring D.amazing 2A.speak B.chat C.sing D.debate 3A.so B.Instead C.Besides D.However 4A.fault B.attack C.news D.pain 5A.doubt B.hope C.treatment D.delay 6A.persuade B.allow C.warn D.organize 7A.determined B.frightened C.satisfied D.surprised 8A.friends B.family C.schoolmates D.roommates 9A.amused B.shocked C.affected D.frightened 10A.explain B.form C.share D.change 11A.turnup B.givein C.breakup D.cutdown 12A.gain B.treasure C.spend D.spare 13A.Talk B.Forget C.Care D.Dream 14A.devoted B.limited C.admitted D.lost 15A.continued B.reminded C.sighed D.cried 16A.inplaceof B.infrontof C.inchargeof D.insearchof 17A.replaced B.ended C.began D.decorated 18A.motto B.principle C.rule D.opinion 19A.Finally B.Obviously C.Actually D.Entirely 20A.mouthed B.typed C.recorded D.wrote
如图甲所示在平行虚线MNPQ间有垂直于纸面的交变磁场两虚线间的距离为d磁场的磁感应强度随时间变化的规律如图乙所示磁场变化的周期为T.一质量为m电荷量为q的带电粒子在虚线MN上的A点以垂直于MN向右射入两虚线间若磁场的磁感应强度B0=不计粒子的重力则下列说法正确的是
1分﹣Lucyisnotcomingtonight. ﹣Butshe! A.promised B.willpromise C.hadpromised D.promises
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